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Steel rail for passenger and freight mixed carrying and production method and application of steel rail

A rail, passenger and cargo technology, applied in the field of mixed passenger and cargo rails, can solve problems such as contact fatigue damage

Active Publication Date: 2015-10-21
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the early stage of the use of rails on passenger-freight mixed lines, due to their high gauge angular strength and hardness and good wear resistance, they are prone to contact fatigue damage. Special attention is paid to fatigue performance

Method used

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  • Steel rail for passenger and freight mixed carrying and production method and application of steel rail
  • Steel rail for passenger and freight mixed carrying and production method and application of steel rail
  • Steel rail for passenger and freight mixed carrying and production method and application of steel rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The steel containing the chemical composition No. 1 in Table 1 was blown by converter, LF refined, and RH vacuum treated and then cast into a continuous casting billet. Then the billet was sent to a walking heating furnace to be heated to 1300°C and held for 3 hours. The billet was rolled For the steel rail of the 60kg / m rail type, the steel rail after the final rolling is erected on the roller table by using a turning stand. The Kundao is transported at a speed of 4.8m / s, and the rail is rapidly cooled using a water-steam mixture as the cooling medium. The rapid cooling temperature is controlled to be 860°C, the cooling rate is 5.2°C / s, and the final cooling temperature is 446°C. After rapid cooling, the H 2 、C 2 h 2 and CH 4 The three gases are mixed into combustible gas at a volume ratio of 1:1.5:4, and the volume ratio of combustible gas to oxygen is 1:3, and the part of gauge angle 1 is heated by flame (such as Figure 5 Shown) in the form of rapid heating. Co...

Embodiment 2-5 and comparative example 1-5

[0057] Examples 2-5 follow the method of Example 1, but the operating process control parameters are different from those of Example 1. The specific operating process control parameters are shown in Table 2, and the rails prepared according to the method of Example 2-5 are A2-A5. The difference between the processing method in the comparative example and the embodiment is that the step of rapid heating and heat preservation after the rapid cooling is not carried out. The control parameters of the specific operation process are as shown in Table 2. The steel rail prepared according to the method of comparative examples 1-5 is D1 -D5.

[0058] Table 2

[0059]

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Abstract

The invention discloses a steel rail for passenger and freight mixed carrying and a preparing method of the steel rail. The track distance of the steel rail for passenger and freight mixed carrying is formed by a globular pearlite structure, the thickness of the track distance ranges from 3 mm to 5 mm, the rigidity ranges from 311 HB to 350 HB, and the ductility ranges from 12.5% to 16%. The preparing method includes the steps that the steel rail obtained after final rolling is rapidly cooled; and then rapid heating and heat preservation are carried out on the part of the track distance. The conditions of rapid cooling comprise the starting cooling temperature ranging from 800 DEG C to 880 DEG C, the cooling speed ranging from 2 DEG C / s to 6 DEG C / s, and the final cooling temperature ranging from 430 DEG C to 470 DEG C; and according to conditions of rapid heating and heat preservation, the temperature of the track distance rises to 700 DEG C to 800 DEG C with the temperature rising speed ranging from 3.0 DEG C / s to 4.0 DEG C / s for heat preservation for 2 min to 4 min. The steel rail for passenger and freight mixed carrying has the high strength, the high abrasive resistance and the high contact fatigue resistance, and particularly has the excellent abrasive resistance and the excellent contact fatigue resistance in the earlier stage of use.

Description

technical field [0001] The invention relates to a steel rail for mixed use of passengers and goods, a production method and application thereof. Background technique [0002] At the end of 2013, my country's railway operating mileage had reached 98,000 kilometers, and in addition to more than 10,000 kilometers of high-speed passenger railways and dedicated freight passages, about 80,000 kilometers of passenger and freight mixed railways in my country's passenger and freight transportation played a huge role in transportation. [0003] An important feature of the passenger-freight mixed railway is the simultaneous opening of passenger trains and freight trains. Passenger trains are usually fast and have light axle loads. They usually have less wear on the rails and have higher requirements for contact fatigue performance; while freight trains are usually slow and have heavy axles, and the rail damage is mainly due to abrasion. Therefore, during the early use of the passenger...

Claims

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Application Information

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IPC IPC(8): C22C38/24C21D9/04E01B5/02
Inventor 邓勇郭华贾济海韩振宇王春建汪渊袁俊
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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